"In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid, or solid."
Study of longitudinal pressure waves that propagate through various media, such as air, water, solids, and gases.
Properties of sound waves: The different characteristics of sound waves, such as frequency, amplitude, and wavelength.
Production of sound waves: The sources of sound waves, including vibrating objects and changing pressure.
Measurement of sound waves: Methods for measuring sound waves, including decibels and frequency analysis.
Wave propagation: The behavior of sound waves as they travel through different mediums, such as air and solids.
Reflection, absorption, and transmission: How sound waves interact with surfaces, materials, and barriers.
Perception of sound: How the human ear and brain process and interpret sound waves, including pitch and loudness.
Noise pollution and control: The effects of excessive noise on human health and ways to manage and reduce noise levels.
Acoustic design and engineering: The use of sound-absorbing materials, acoustical building design, and noise-reducing technologies to improve the quality of sound in different spaces and environments.
Musical acoustics: The physics of musical instruments and sound production, including harmonics and resonance.
Ultrasonics: The application of high-frequency sound waves in imaging, medical diagnostics, and industrial processes.
Longitudinal waves: These waves are also known as compressional waves. They are made of vibrating particles that move parallel to the direction of the wave's travel. Sound waves are examples of longitudinal waves.
Transverse waves: In transverse waves, particles move perpendicular to the direction of the wave's travel.
Standing waves: These waves occur when a wave travels back and forth between two fixed points. The movement of the wave causes constructive and destructive interference, creating regions of increased and decreased amplitude.
Surface waves: These waves occur at the boundary between two different mediums. The waves move along the surface of the medium and are a combination of longitudinal and transverse waves.
Ultrasound: These are high-frequency sound waves that are used for medical imaging. They have a frequency above 20,000 Hz, which is beyond the hearing range of humans.
Infrasound: Infrasound refers to sound waves with frequencies below 20 Hz. They are often produced by natural phenomena such as earthquakes or thunderstorms.
Noise: Noise is a collection of sounds that are random and unpredictable. It can be caused by a variety of sources, such as machinery or traffic.
Harmonics: Harmonics occur when sound waves of different frequencies combine to create a complex waveform. This occurs frequently in music, as different frequencies of sound are combined to create chords and other complex sounds.
Resonance: Resonance occurs when a sound wave matches the natural frequency of an object, causing it to vibrate. This phenomenon can be used to create musical instruments and other devices.
"In human physiology and psychology, sound is the reception of such waves and their perception by the brain."
"Only acoustic waves that have frequencies lying between about 20 Hz and 20 kHz, the audio frequency range, elicit an auditory percept in humans."
"In air at atmospheric pressure, these represent sound waves with wavelengths of 17 meters (56 ft) to 1.7 centimeters (0.67 in)."
"Sound waves above 20 kHz are known as ultrasound and are not audible to humans."
"Sound waves below 20 Hz are known as infrasound."
"Only acoustic waves that have frequencies lying between about 20 Hz and 20 kHz, the audio frequency range, elicit an auditory percept in humans."
"Sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid, or solid."
"In air at atmospheric pressure, these represent sound waves with wavelengths of 17 meters (56 ft) to 1.7 centimeters (0.67 in)."
"Sound waves above 20 kHz are known as ultrasound."
"Sound waves below 20 Hz are known as infrasound."
"Only acoustic waves that have frequencies lying between about 20 Hz and 20 kHz elicit an auditory percept in humans."
"Sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid, or solid."
"Sound waves above 20 kHz are not audible to humans."
"In air at atmospheric pressure, sound waves have wavelengths of 17 meters (56 ft) to 1.7 centimeters (0.67 in)."
"Sound waves above 20 kHz are known as ultrasound."
"Infrasound refers to sound waves below 20 Hz."
"Only acoustic waves that have frequencies lying between about 20 Hz and 20 kHz elicit an auditory percept in humans."
"Sound is a vibration that propagates as an acoustic wave."
"Different animal species have varying hearing ranges."